Speed-gearing for automobiles.



A( P. B11113111; 'SPEED GEARING F0@ MloMoBnEs. n APPL'lc/Ai' FILED 050.19, 191s. 1,179,069. Patented Apr.11,1916.

2 SHEETS-SHEET I- 7. Y l ,1 Igel; l( "MMMM A.I P, BRUSH'. sPEl- (aE/WNS For? AUTOMOBILES. APPLICATION NLE-'0" Ecg' ma.

1,179,069. Patented Apr.11,1916.

2 SHEETS-SHEET 2.

15' fof ensei u dr shafand ether means vek lid beveledi pinion at ,y y ter meda-Q the ldl'reet j i'w e, fand Q it is usedfpreferenmllyfby.mOstfauwmObQ-dfweontlruetlens; in use, f compromises; and the Yaitins athegicenceptons .of the'y init'jheigreatest use of new A(if thel Vroadfcondiy 'zippificfigggned member 19,*191

:beveled gw meinen. are; aslto lessen phes'p'ee'd reductie ,7.

t 90 'pe cent. of the Cali! mileage, L is eliminated the noise-,

he: 17's expeetedfezencounter.

' ,I ether this and is :obj ectionall -Thefpresent sin solve thatV proble y:tran'sin'is sionf smell` spz'icefil tion when the rear end of the case ,has been cut away. Fig. 3 is a side elevation of the front part of the mechanism when the case is broken away, andthe rear part of this view is a vertical section through-the center of the driving s'hit't. Fig. 4 1s a sectional end view of the driving shaft, and one of the sprockets thereon. Fig. 5 is a plan view of those parts of the two shafts on which are the teeth for clutching the sprockets thereto; and Fig. 6 is a diagrammatic representation of the invention.

Two parallel disalined shafts, viz., the driving shaft 10 and the driven shaft 11 are mounted in the transmission case 12. The

driving shaft projects out through the'front end of the case in order that it may be connected, in the usual or any suitable manner with the crank shaft of the motor; while the driven shaft projects out through the rear end of the case in order that it may be connected vin the usual or any suitable manner with the driving pinion of the differential mechanism.

A wide gear 13 is :fixed to the driving shaft; and two gears 14 and 15, of different. diameters, are fixed to the driven shaft. Intermediately placed is a gear-carrying sleeve 16 which is mounted on a fixed cylindrical spindle 17, so as to be capable of rotating and of movin endwise thereon. This sleeve carries severa gears', viz. the'gear 18 which is always in mesh with the wide gear 13, irrespective of the position' of the sleeve, wherefore the sleeve always rotates when the driven shaft rotates; a gear 19 which may be caused to mesh with gear 14 by the movement. of the gear sleeve 16 from its neutral position, as shown, toward thefront endA of the case; a gear 20 which maybe caused to mesh with gear 15 bythe movement of said gear sleeve rearward from its neutral position; and a gear 21, which, when said gear sleeve is in the neutral position is in the'same transverse `plane with -gear 14, but is of such small iameter that it cannot mesh-therewith. A reversing ear 22v is rotatably mounted on a fixed spin le 23, and'normally'occupies tls.. position shown 1n front of but out of mesh with gears 14 and 21. At least it must be out of mesh with gear 14, -but' may be in mesh with gear. 21, if de# sired. By moving this reverse gear rearward, it will slip into mesh with both of the gears 14 and A21, Yand thereby be come part of'a` I said gears; as we as the gears 13 and 18,- through which gear train the driven shaft is turned by the driving shaftfat relatively slow speed and in the reverse direction.

When the gears 14 and 19 are caused to mesh by the endwise forward movement off.

the gea-r sleeve 16, they, together .with the gears 13 and 18, constitute a gear train shafts,

through which the driving shaft turns the driven shaft at relatively slow speed, but in the same direction. When, by the rearward endwise movement of the sleeve 16,; the gear 2O is slipped into mesh with gear 15, these two gears,togethe'r with the gears 13 and 18 constitute a` gear train through which the driving shaft turns the driven shaft in the same direction and at a rate which, although slower than that of the driving shaft, is nevertheless faster than the rate at which it turns when power is being transmitted to it by the geartrain last mentioned. These several gear trains, together with suitable means for moving the gear sleeve 16, and the reversing gear 22 endwise, furnish means for securing the necessary emergency drives-that is to say, for

backing the car, for starting the car, and for propelling it forward at such a speed ratio that it can easily negotiate steep hills or heavy roads. Y

Loosely mounted upon the driving shaft are two sprocket wheels 25 and 26. Loosely mounted on the drivenr shaft are two other sprockets 35 and 36. A silent chain belt 40' Ysprocket wheels, the two chainvbelts 40, 41.

may be of the same length. lWhen one pair of sprocket wheels 25-35 are connected with their respective shafts, the driven shaft will turn in the same direction as the driving shaft, but at a slightly slower rate, and in that event both shafts will rotate within the other two sprockets without necessarily turning them. When lthe two sprockets 26-36 are connected with their respective the driven shaft will be turned in the same direction as the drivin shaft, but at a slightly higher speed; an when this connection has een made the two shafts will rotate within the other two sprockets ris without necessarily turning them. In order to clutch or connect these-sprocket wheels properly with their respective shafts, both sprockets on the driving kshaft are provided in their adjacent ends with internal gear teeth 27 and 28, respectively, and on the lgear train which. includes shaft are teeth 29 which, when 4the sprockets are in theirneutral position `are in a s ace between the adjacent ends. of thesesai internal gear teeth. A The two sprocket wheels 35.-'-36 are similarly provided intheir ad` jacent ends with internal gear teeth 37-39,

and the driven shaft is provided with teeth f f which normally occupy positions betweenl but out of/eont/act with the adjacent ends of in. aiagintemaiger teeth.; lnfiinol luesfor the characteristic' whiomhwelr efiiciencyof the devictheteeth theoriwen Shaft 'la-rei Shorteriythaa .the teeth. on; 6 driving of the'shfts', as shown in Means,.to be presentlyexp1ained, are providedgby' which to. move a1 1cfour1.ofvthese sprockets .lengthwise of ytheir yshafts, ,equally and in' the 1o same direction. `Ifthey are all moy-eid .reale ward', foreXanIPIe, ,theintrliil gea? ethf of the-sprocket 'wheel25 willlrst 51. over the teetlion the driving shaft, afterwhioh.

said sprocket rwh'eel-f.andiy chain will., v of necessity, vmove `1n nlsonwith said flrlvlng shaft. "Immediatelyfafter Suid. sprocket und chain .livstai'fediiritimtiong the internal a the teeth 'onthe drivnshaft, and thereafter of teeth ofdifferentv length, VA'as statehr. the

inertia ofthe two sprocket wheels and chain will .rstj be `overcome by Vtheir conneotion with the' drivingl shaft, and'when they are in motion, the driven s'haftowillbe"'picked up and its. inertia overcome with less stra-.n than if both sprockets'- were connected with their respectiveslrafts at the same time.

If all four sprockets/be moved forward.,

the internalgearteeth of the twosproclrets' 26361will slipoverthe teeth-'dn the two shafts, but` will not/do this'simi-ltaneously Vbut successively, as'.beforeexplained In order, .to facilitate the simultaneous movement of the' four' sprocket s;.and chainscarriedthereby, theends-of the two sprock` etson the driving Shaftand th'efeiids of the' rock shaft 58. .vIn'the concave surface of each of these twocurved armszisC a groove which receives the dianges ofthe two associatedfsprocket wheelsgthats to. say, the

curved arm .51, and therf'two ianges 35a and 36 enterfthe groove-52a in' theourv'ed armi 52. By thissimplev means the sprockets are: l held in ,thef-fequired relation" to one another, f

and `are. ,simultaneously moved lengthwise of the two shaftswith the results above pointed out. z.

It will; be Observ'safthat when either tf' the emergency :gear vvtrainslfirst referred to are rendered operative to bring about 4either of the three emergency 'speed ratios, the two shaftsA may .bewgrotate'd'within the four'v sprockets withot turning'y them. When i either pair'of'- sprocketslis; connected 'with 'sleeve .is not, however, a matter ,ofifiinpor vdriven shaft to be driven at any desired f sprocket i 'wheels bear i the relation to' each q quired'two sizes of sprocket wheels end one 90 fl l length ofchain belt.- 1 V priority suitable means foi"selectively 'mow f V gear 22, or the .four vsprocket'wheels,referred "to maybe emplOyQd, andthere vis .quite 21'95" ing 'ends Vnecessary hereto describe any meafnsfforf 'se' driving f shaft, .two coperating sprocketl f the two shafts thev other pair sprocketsl need not turn,v but at all-'times the `lgear sleeve. 1 6 will turn.- fThe. turning-of'th'i tance, since .it is doing no worlr unless/Some 'ittv emergencygear train is inservice, Vand-is'-v vtherefore -subjectedto no strain-I and .willlv'fw therefore'be practically noiseless.. :l

` As 'before stated,vthetwo vchainV belts fandfj their Yassociated. sprockets .provide ain' o\'e`ri 7b5 step and an understep` transmitting mecha-vg' nism. The relative sizes ofthe sprockets are i optional, and may be such1z1s.. will causethe slower-.mtg o r any .desired faster rate than 01 the ldrivingshaft. When vthe VSize-off*thea``7 l other. above,f deseribed, "the, over 'step j and. Under step rates et whiChthedrivn shaft f Y. turns, bear reciprooalrelations tothe'speed 8591 of the ,drivingN hilft.; Likewise:` tliiseon.- Q

gallizattm'of the device there is 'onlyre ing hegear Sleeve 16, andthereversing r i variety of suoli Iliohanisms in loo inmori.use f in the art.` For example', there'may be three edwise movable rodsV 60, Gland 6,2. ilhe rod 60 may carry a forked arm 6 0, which engages with' thesides ofthe reversing gear .1091 22. The rod lfinay carry' a forked arm.' which engages witlrthe sides of the'igear 18,' and thereby. th'ggear sleevev 16 rmayabfe f moved. '.The third 'rod 62 may h aveanxai'm" r 62a which is provided with a stub 612i",whicltfiylr y projects into a Slot in the arm' 57.` Itisn-ot lectively moving these three rods "exidwise.v i So far asv the present lnventionls'coifcerned they might be moved hand, but, as'amat. 1.10 f' i ter offact, there is a wide varietyofmeehanisms known in thisart through which'ithe v, driver `'of a car may selectively moire vsiny. Y one of these rods in either'directiontd bring .f about any of the results which willffollow 1.1.5

the movementfof the reversingfgear.22the 1 gear sleevel 16, or ythe.sprockets.andig theiri f' chain belts, as above described. i

Havingdescribedmy invention, I ola" 1. 'In speed gearing, thecombin'tion 129 1 two parallel` lbut disalined 'shafts, ,.vi'r, IVa.;

driving anda driven shaftgearsfixe r-to said shafts, an intermediatel rotatahlf"S -',`end f wise movable gear sleeve carrying aj plurality of lgears Aforimeshing with gears vonthfe driv` 1254 ingand driven shafts, two sprockety Wheels of, di1ferent sizes loosely mounted .,:on ;-t he` If wheels'l of different sizes'loosely lmountedfon the driven shaft, two etais -belts each, Jo-150;

, project one from the front end and the other from the rear end of said case, gears fixed to said two shafts, 'a non-rotatable shaft Within said casing, a gear sleeve rotatively mountedand movable endwise upon said fixed shaft and carrying a plurality of gears for meshing With the gears on the driving and driven shafts, two sprocket Wheels loosely mounted on the driving shaft within said gear case, two sprocket Wheels loosely mounted on the driven shaft Within said gear case, two ohainbelts each running over a pair of sprockets, viz. one on each shaft, and mechanisms by which to selectively move said gear carrying sleeve or to connect either pair of chain connected sprockets with the two shafts7 as desired.

3. In speed gearing, the combination of sprocket Wheels, Viz. one sprocket onv each.l

shaft, clutch mechanisms by which to connect either pair of sprocket Wheels with said shafts, and mechanisms by which to selec tively move the gear sleeve to cause the intermeshing of the desired gears-or to clutch either pair of sprocket Wheels to the two' shafts on which they are mounted.

' In testimony whereof, I hereunto affix my signature in the presence of two Witnesses.

ALANLSQN P. BRUSH. Witnesses:

E. B. GILCHRIST,

L. I. PORTER. 

